6400 MERRILL CREEK PKY 2018-01-01 MF Import

r ( undisturbed till or structural fill, the latter being compacted to at least 95 percent of the MDD (ASTM D-1557)and eztendi�q horizontally a distance aqual to cwo and one-half:imes the depth ( of the footing. Passive resistancc should be calculated from the bouom of the adjacent floor slabs or paving, or at a depth of 1 foot betow the gcound surface, if the adjacent area is unpavod. ( Frictional resistance of footings and the building slab should be evaluatad �sing 0.4 for the � coefficient of base friction. 'Ibe above values incorporate a factor of safety of about 1.5. I DRAINAGE CONSIDERATIONS We reccmmend t6at all surfaces be sloped to drain away from the proposed building area. ( Pavement surfaces and opea space areas should be sloped such that surface water �unoff is oollected and routed to suitable dischazge points. � A seasona(ly shallow "perched" ground water condition can be ezpeded within the weathered till wne. In addition, water will accumulate in sandy zones within the unweadierod r till. The most probable area where near-surface seepage may accumulate against the footings 1 and/or beneath the floor slab is along the east portion of the building where some cut wHl be required to zstablish floor grade. We recommend that a footing drain be iastalled along the east I side of the building W intercept any near�urface seepage. 'Eais drain should be installed u close � to the bottom grade of the adjaceat footing as possible while atill maintaining a minimum � gradient. The drain should be laid to flow to the south and be connected to the storm drain system for the yazd area. 'Ibe drain should consist of perforated pipe a minimum of 4 inches in diameter enveloped in a bacicfill of washed gravel drain rock. 1t�e drain roc'_ bacld'ill should � eztend to the base course material if the area is to be paved or W within 10 to 12 inches of the finished surface if the azea is to be landscaped. If the drain is under a landscaped area, we � recommend sepazating the drain rock from the overlying topsoil wiU►a geotextile such a4 Mirafi 140N, Polyfelt TS600 or compazable fabric to prevent migration of fines from the topsoil into the drain rock. ( All roof drains should also be connected to the yazd azea storm disposal system. �e roof drainpipes should be kept sepazate from the footing drainpipes. � Any seepage encountered during construction is expected to be fairly limited in extent. Seepage into footing excavations shouid be diveRed from the beazing surface by shallow ditches � to collection sumps and removed by pumping, if necessary. PAVEMENT RECOMMENDATIONS � We recommend that pavement subgrades be prepazed in accordanc� with the previously described site prepazation and structural fill recommendations. A 6-to 9-inch-thick subbase layer � of clean (less than 5 percent fines) pit run sand and gravel may be required to protect the subgrade if grading occura during wet weather. � We understand that traffic at the site wiil generally consist of passenger cars, delivery vans and smaller trucks. Only occasional (once or twice per day)large trucks aze planned. An asphalt � G c o E o Q i n e e r � 11 Fle No.3286-002-ROUO2Q79�